Date.prototype.format = function (fmt) { //author: meizz 
var o = {
    "M+": this.getMonth() + 1, //月份 
    "d+": this.getDate(), //日 
    "h+": this.getHours(), //小时 
    "m+": this.getMinutes(), //分 
    "s+": this.getSeconds(), //秒 
    "q+": Math.floor((this.getMonth() + 3) / 3), //季度 
    "S": this.getMilliseconds() //毫秒 
};
if (/(y+)/.test(fmt)){ fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));}
for (var k in o){
if (new RegExp("(" + k + ")").test(fmt)){ fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));}
}return fmt;

};
